Add pre-commit.ci config.

Add pre-commit config for GitHub Actions CI.

.github/workflows/pre-commit-ci.yml

@@ -0,0 +1,19 @@
+name: pre-commit-ci
+
+# we run pre-commit only on push
+on:
+  - push
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        # to have unlimited depth for pushing
+        fetch-depth: 0
+    - uses: actions/setup-python@v2
+    - uses: pre-commit/action@v2.0.3
+      # to allow pushing
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}

.pre-commit-config.yaml

@@ -82,3 +82,16 @@ repos:
       # dependencies available
       --ignore-missing-imports
     ]
+
+
+# continuous integration configuration for pre-commit.ci
+# freely available to open-source repositories
+# it will not be run until we are open-source
+ci:
+  autofix_commit_msg: |
+    [pre-commit.ci] auto fixes from pre-commit hooks
+  autofix_prs: true
+  autoupdate_commit_msg: '[pre-commit.ci] pre-commit autoupdate'
+  autoupdate_schedule: weekly
+  skip: []
+  submodules: false